JP6406718B2 - Indexable asymmetric cutting inserts and cutting tools for indexable asymmetric cutting inserts - Google Patents

Description

The present invention relates to an indexable cutting insert and a cutting tool for an indexable asymmetric cutting insert, in particular a cutting insert with two cutting parts and a cutting for an indexable asymmetric cutting insert. Related to tools.

BACKGROUND OF THE INVENTION Cutting tools such as milling cutters, grooving cutters and saws have a plurality of cutting inserts held on the peripheral surfaces of their tool bodies. The cutting insert may have multiple cutting edges, and each insert may be indexable for use with another cutting edge when a particular cutting edge is worn or damaged. The indexable cutting insert can have two cutting edges, which are rotated with respect to each other. The cutting tool body may have each insert retaining portion suitable for receiving an indexable cutting insert. Cutting inserts and cutting tools as described above are shown, for example, in German 1602695, US Pat. No. 5,020,944, US Pat. No. 7,553,112, US Patent Application Publication No. 2012/269588 and International Patent Publication No. 2011/159119. Has been.

SUMMARY OF THE INVENTION According to the subject matter of the present application, there is provided a cutting insert having a longitudinal insert axis extending perpendicular to the insert lateral intermediate surface, the cutting insert comprising:
Two end faces and a peripheral face extending between them, the end faces being arranged on both sides of the intermediate face, facing in opposite directions and intersected by a longitudinal insert axis And a peripheral surface extending between them,
Two insert portions extending on both sides of the intermediate surface, each insert portion being
A cutting projection that extends longitudinally from one of the end faces in the direction of the intermediate face, and intersects the rear face, the flank face facing in the opposite direction, the rake face, the rake face and the flank face. A cutting protrusion having a main cutting edge formed between the two main cutting edges extending between the two main cutting edge ends; and
Clamping recess formed along the rear surface of the cutting protrusion,
Including two insert parts including
A line connecting the longitudinal projections of the main cutting edge ends of each main cutting edge in a direction parallel to the insert axis forms a cutting edge projection, and the projections of both main cutting edges are non-zero degrees between them. Forming a first angle of
The rake face of the cutting protrusion is arranged on the end faces on both sides of the cutting insert.

According to another aspect of the subject matter of the present application,
A tool body having an outer surface and having at least one insert pocket formed in the outer surface;
There is provided a cutting tool comprising at least one cutting insert as described above, held in at least one insert pocket.

According to a further aspect of the subject matter of the present application, there is provided a cutting tool as described above, wherein
The peripheral surface of the cutting insert has two contact recesses, each of which extends in a direction away from each clamping recess in a direction parallel to the insert shaft, and the contact recess faces in a direction away from the insert shaft,
Each insert pocket
A pocket contact surface in contact with any one of the insert contact surfaces of the contact recess of the cutting insert;
A pocket clamping surface in contact with the insert clamping surface of the first recess of the clamping recess of the cutting insert;
A pocket support surface in contact with one of the rake faces of the cutting insert,
The cutting tool further includes a clamp member having a member clamp surface and first and second member fixing surfaces,
When the cutting insert is placed in the insert pocket, the clamping member is clamped against the insert pocket such that the member clamping surface is pressed against the insert clamping surface of the second recess of the clamping recess of the cutting insert.

BRIEF DESCRIPTION OF THE DRAWINGS For a better understanding of the present invention and to show how it can be practiced, reference will now be made to the accompanying drawings.

It is a front perspective view of the cutting tool by the embodiment of the present invention. FIG. 2 is a diagram of the cutting tool of FIG. 1 partially exploded. It is a back perspective view of the cutting tool of FIG. FIG. 4 is a diagram of the cutting tool of FIG. 3 partially exploded. It is a partial perspective front view of a part of the cutting tool of FIG. FIG. 2 is a partial perspective rear view of a part of the cutting tool of FIG. 1. It is a side view of a part of the cutting tool of FIG. It is a side perspective view of the cutting insert by the embodiment of the present invention. It is another side perspective view of the cutting insert of FIG. It is a side view of the cutting insert of FIG. FIG. 11 is another side view of the cutting insert of FIG. 8 facing away from the side view of FIG. 10.

  It will be appreciated that for simplicity and clarity of illustration, elements shown in the drawings have not necessarily been drawn to scale. For example, the dimensions of some elements may be exaggerated with respect to other elements for clarity, or some physical components may be included in one functional block or element. There may be. Further, where considered appropriate, reference numerals may be repeated throughout the drawings to indicate corresponding or analogous elements.

DETAILED DESCRIPTION OF THE INVENTION In the following description, various aspects of the present invention will be described. For purposes of explanation, specific configurations and details are set forth in order to provide a thorough understanding of the present invention. However, it will also be apparent to one skilled in the art that the present invention may be practiced without the specific details set forth herein. Furthermore, well-known features may be omitted or simplified in order not to obscure the present invention.

  Reference is now made to FIGS. 1-7 illustrate various appearances of a cutting tool 150 according to an embodiment of the present invention. The cutting tool 150 includes a tool body 152 having a front surface 153, a rear surface 154, and an outer surface 155 extending therebetween. A plurality of insert pockets 156 are formed on the outer surface 155. A cutting insert 100 is held in each of the insert pockets 156.

  Still referring to FIGS. 8-11 illustrate various aspects of the cutting insert 100 according to an embodiment of the present invention. The cutting insert 100 has a longitudinal insert axis A that extends perpendicular to the insert transverse intermediate plane P. The intermediate plane P is determined by intersecting transverse insert axes B, C that are perpendicular to each other and to the longitudinal insert axis A. The cutting insert 100 has two end surfaces 102 and a peripheral surface 104 extending therebetween. The end faces 102 are arranged on both sides of the intermediate plane P, face in the opposite direction and are intersected by the longitudinal insert axis A.

  The cutting insert 100 includes two insert portions 106, and each insert portion 106 is disposed on both sides of the intermediate surface P. In each insert portion 106, the cutting protrusion 110 extends in the longitudinal direction from one end surface 102 in the direction of the intermediate surface P. Each cutting projection 110 has a rear surface 115, a flank surface 114 facing in the opposite direction, and a rake surface 112. The rake face 112 faces away from the intermediate face P and generally in the direction of the longitudinal insert axis A, and the flank face 114 faces away from the longitudinal insert axis A. The main cutting edge 116 is formed at the intersection of the rake face 112 and the flank face 114. In a particular embodiment, as shown in the drawings of the present application, each main cutting edge 116 has two oblique secondary cutting edges 117 that form a V-shaped main cutting edge 116. Each rake face 112 may further have two oblique sub-faces 120, which form a V-shaped rake face 112. Each insert portion 106 includes a clamping recess 108 formed along the rear surface 115 of the cutting protrusion 110 (ie, on the opposite side of the cutting protrusion 110 from the flank 114). In some embodiments, the clamping recess 108 may be disposed adjacent to the intermediate surface P.

  With particular reference to FIG. 9, each main cutting edge 116 extends between two main cutting edge ends 136. The corner cutting edge 131 extends from the main cutting edge end 136 toward the corner cutting edge end 132. The second cutting edge 134 extends laterally with respect to the main cutting edge 116 along each rake face 112 from the corner cutting edge end 132.

  The main cutting edge end 136 of each main cutting edge 116 may be projected in a direction parallel to the insert axis A, and the line connecting these projections is shown in FIG. The blade projections 118 of both main cutting edges 116 form a non-zero first angle α therebetween. Accordingly, both of the cutting protrusions 110 are similar to each other, are disposed on both sides of the intermediate surface P, and are positioned at the first angle α. In some embodiments, the first angle α may be in the range of 30 ° to 150 °. In certain embodiments, the first angle α may be a 90 ° angle.

  Further, the rake face 112 of each cutting projection 110 is disposed on the end faces 102 on both sides of the cutting insert 100 (ie, on a different face of the end face 102 and on a different side of the intermediate face P). The cutting insert 100 has an elongated shape, one longitudinal dimension parallel to the insert axis A, and two smaller than transverse to the longitudinal dimension (eg, extending along the projection 118 of the cutting edge). It will be appreciated that it has dimensions.

  With particular reference to FIG. 8, the peripheral surface 104 of the cutting insert 100 has two abutment recesses 122, each extending longitudinally from each clamping recess 108 toward the opposite end surface 102. . The contact recess 122 is disposed so as to face away from the insert shaft A. In particular, each of the contact recesses 122 is arranged to face a different direction away from the insert shaft A. Each abutment recess 122 has at least one insert abutment surface 124 to abut each surface of the insert pocket 156, as will be described in detail herein below. The abutment recess 122 can have two insert abutment surfaces 124 that form an abutment angle β therebetween (shown in FIG. 8). In certain embodiments, the abutment angle β may be an angle of 120 °. Each contact recess 122 may extend on both sides of the intermediate surface P such that the contact recess 122 overlaps in the vertical direction along the vertical insert axis A. However, the clamping recess 108 may not overlap along the longitudinal insert axis A.

  As can be seen in the figure, the cutting insert 100 is indexable but is specularly asymmetric about the intermediate plane P, and about the longitudinal insert axis A as well as two that determine the intermediate plane P. It is rotationally asymmetric about the intersecting transverse insert axes B, C. Thus, the cutting insert is symmetrical only about 360 ° (or multiples thereof) rotation about any of its axes A, B and C.

  The insert clamp surface 130 extends obliquely within each clamp recess 108 from the adjacent contact recess 122 toward the adjacent rear surface 115. In the side view of the cutting insert 100, for example, as shown in FIGS. 6 and 10, each of the insert clamping surfaces 130 forms an insert axis A and a clamping angle γ. In some embodiments, the clamp angle γ can be an acute angle. In certain embodiments, the clamp angle γ can be in the range of 60 ° to 80 °.

  1-7 again, each insert pocket 156 of the cutting tool 150 has a pocket abutment surface 158, a pocket clamp surface 160 and a pocket support surface 162. When the cutting insert 100 is placed in the insert pocket 156, the pocket abutment surface 158 receives one insert abutment surface 124 of the abutment recess 122 of the cutting insert 100. The pocket clamp surface 160 receives one insert clamp surface 130 of the clamping recess 108 of the cutting insert 100. The pocket support surface 162 receives one of the rake surfaces 112 of the cutting insert 100. The insert pocket 156 further includes first and second pocket fixing surfaces 170, 171. The first pocket fixing surface 170 extends from the pocket contact surface 158 in a direction away from the outer surface 155 of the cutting tool main body 152. The second pocket fixing surface 171 is disposed on the opposite side of the first pocket fixing surface 170 and faces it. The insert pocket has a fastening hole 174 disposed adjacent to the pocket fixing surfaces 170, 171 and extending away from the outer surface 155 of the cutting tool body 152.

  The cutting tool 150 further includes a clamp member 164 for fastening the cutting insert 100 to the insert pocket 156. The clamp member 164 has an elongated shape, and has a member clamp surface 166 at the front end portion thereof, and first and second member fixing surfaces 172 and 173 positioned rearward from the member clamp surface 166. The clamp member 164 also has a through-hole 176 extending therethrough and extending along the member securing surfaces 172, 173 and passing therebetween.

  When the cutting insert 100 is placed in the insert pocket 156, the clamp member 164 is in a state where the member clamp surface 166 faces the insert clamp surface 130 and the fastening screw 178 is between the clamp member 164 and the insert pocket 156. It is arranged. The fastening screw 178 is threaded in the through hole 176 of the clamp member 164 and the fastening hole 174 of the insert pocket 156. The fastening screw 178 can be actuated by a key inserted through the opening of the through hole 176 of the clamp member 164.

  When the fastening screw 178 is tightened (eg, as shown in FIGS. 5 and 6 partially viewed), the clamp member 164 is tightened against the insert pocket 156, resulting in the clamp member securing surfaces 172, 173. Contacts the respective pocket fixing surfaces 170, 171, and the member clamping surface 166 is pressed to the used one of the insert clamping surfaces 130 of the cutting insert 100. The member clamping surface 166 thereby applies a clamping force F to the used insert clamping surface 130 and ensures a positive clamping of the cutting insert 100 into the insert pocket 156. Accordingly, the cutting insert 100 has no through-hole for clamping and is attached to the insert pocket 156 only by external clamping applied by the clamping member 164. Due to the clamping angle γ between the insert clamping surface 130 to be used and the insert axis A, the force F has a force component directed towards the holder body 152, thereby pressing the cutting insert 100 towards the holder body 152. Hold it in a state.

  The fastening screw 178 may have two spaced screw portions 180 for threading engagement with each thread surface along the through hole 176 and the fastening hole 174. One of the screw portions 180 of the fastening screw 178 is for a left-handed screw, while the other screw portion 180 is for a right-handed screw (ie, the opposite screw direction for attaching the clamp member 164 to the insert pocket 156). In another embodiment, the fastening screw may have a screw portion and a screw head that engages each screw portion of the fastening hole 174 such that the screw head is pressed against each face of the through hole 176. Configured. It is noted that the pocket securing surfaces 170, 171 are configured to prevent the clamp member 164 from moving laterally relative to the through hole 176.

  When the cutting tool 150 is in a usable configuration, ie when the cutting insert 100 is attached to the insert pocket 156 (FIGS. 1, 3 and 5-7), one of the cutting protrusions 110 is in use and the other The cutting protrusion 110 is not in use. The rake face 112 of the cutting protrusion 110 is positioned on a different end face 102 of the cutting insert 100 so that metal chips removed from the workpiece by the cutting edge of the cutting protrusion 110 in use are not being used. It is formed as far as possible from the cutting edge of the protrusion 110. Thereby, contact between the cutting edge of the cutting protrusion 110 that is not in use and the removed metal chips is avoided. Such contact may damage the cutting edge of the cutting protrusion 110 when not in use.

  As detailed above, the end surface 102 and the peripheral surface 104 of the cutting insert 100 according to the present invention have a plurality of irregular surfaces, recesses, corners, intersections, and the like. Therefore, the manufacture of such a cutting insert 100 can be achieved by injection molding. This is because it may be more difficult to manufacture such a cutting insert 100 by press molding.

  When the cutting insert 100 is viewed along the intermediate plane P while facing one of the flank surfaces 114 (eg, FIGS. 7 and 11), the cutting edge width D extending between the corner cutting edge ends 132 is determined by the longitudinal insert. The maximum dimension of the cutting insert 100 perpendicular to the axis A. Therefore, the cutting insert 100 can perform metal cutting such as grooving along the entire cutting edge width D without interfering with the cutting protrusion 110 that is not in use.

  A cutting tool 150 shown in FIGS. 1 to 7 is a rotary tool having a rotation center axis R, and an outer surface 155 of the cutting tool main body 152 is a circumferential surface of the rotary tool. In the rotary tool, the tool body 152 is coupled with a tool shank 168 extending along the rotation axis R. It will be appreciated that the present invention can be similarly implemented with other types of cutting tools other than rotary cutting tools.

  Although the present invention has been described with reference to one or more particular embodiments, the description is intended to be illustrative as a whole and is interpreted to limit the invention to the embodiments shown. Should not. It will be appreciated that those skilled in the art may come up with various modifications not specifically described herein but that are within the scope of the present invention.

Claims (17)

Possess longitudinal insert axis extending perpendicularly to the insert transverse middle plane (P) and (A), said insert transverse middle plane (P) is, by means of two crossed transverse insert axis (B, C) A cutting insert (100) as defined ,
A two end faces (102) and the peripheral surface extending therebetween (104), said end face (102), disposed on both sides of the insert transverse middle plane (P), opposite Two end faces (102) and a peripheral face (104) extending therebetween, which are oriented and intersected by said longitudinal insert axis (A);
Two insert portions (106) extending on opposite sides of the insert lateral intermediate surface (P), each insert portion (106) being
A cutting projection (110) extending longitudinally from one of the end faces (102) in the direction of the insert lateral intermediate face (P), and the rear face (115) and the opposite direction; the flank (114) facing rake face (112), a said rake face (112) and said flank (114) main cutting edge formed at the intersection (116), the two main cutting cutting the protruding portion having a main cutting edge (116) extending between the blade edge (136) and (110),
Wherein wherein said rear surface (115) to be formed along the clamping recess of the cutting protrusion (110) (108), and two insert parts including (106), a
The line connecting the longitudinal projections of each main cutting edge (116) in the direction parallel to the longitudinal insert axis (A) of the main cutting edge end (136) forms the projection (118) of the cutting edge. and projection of both the cutting edge of the front Symbol main cutting edge (116) (118) forms a first angle of non-zero (alpha) therebetween, said first angle (alpha) is 90 ° Is the angle of
The rake face (112) of the cutting protrusion (110) is disposed on the end faces (102) on both sides of the cutting insert (100) ,
The cutting insert (100) has no through hole for clamping,
The cutting insert (100) is rotationally asymmetric about the longitudinal insert axis (A) and about any one of the transverse insert axes (B, C);
Cutting insert (100). Corner cutting edge (131) extends towards the corner cutting edge end from each of the main cutting edge end (136) (132), a second cutting edge (134) of said corner cutting edge end wherein from each of the (132) extending transversely to the front Symbol main cutting edge along each rake face (112) (116), the cutting insert according to claim 1 (100).   Each main cutting edge (116) has two sub cutting edges (117), and the two sub cutting edges (117) are bent at an angle with respect to each other to form a V-shaped main cutting edge ( 116. The cutting insert (100) of claim 1, forming 116).   Each rake face (112) has two sub-faces (120) that are bent at an angle with respect to each other to form a V-shaped rake face (112). The cutting insert (100) according to claim 1, wherein: Said peripheral surface (104) has two abutment recesses (122), each of which is longitudinally away from each clamping recess (108) and towards the opposite end surface (102). Cutting insert (100) according to claim 1, wherein the cutting insert (100) extends and faces away from the longitudinal insert axis (A). The cutting insert (100) according to claim 5 , wherein each of the abutment recesses (122) faces a different direction away from the longitudinal insert axis (A). The cutting insert (100) of claim 6 , wherein each abutment recess (122) has at least one insert abutment surface (124). The has a contact recess (122) has two insert abutment surface (124), said two insert abutment surface (124) forms a contact angle (beta) between them, to claim 5 Cutting insert (100) as described. Cutting insert (100) according to claim 8 , wherein the abutment angle (β) is an angle of 120 °. Each of the two contact recesses (122) extends on both sides of the insert lateral intermediate surface (P) such that the two contact recesses (122) overlap along the longitudinal insert axis (A). The cutting insert (100) according to claim 5 , wherein the cutting insert (100) is present. Cutting insert (100) according to claim 10 , wherein the clamping recess (108) of the insert portion (106) does not overlap along the longitudinal insert axis (A). In each cutting protrusion (110), a corner cutting edge (131) extends toward the corner cutting edge end (132) on both sides of the main cutting edge (116),
In appearance along the insert transverse intermediate surface (P) facing one of the flank surfaces (114), the width (D) of the cutting edge extending between the corner cutting edge ends (132) is The cutting insert (100) of claim 1, wherein the cutting insert (100) has a maximum dimension in a direction perpendicular to the longitudinal insert axis (A). A tool body (152) having an outer surface (155) and at least one insert pocket (156) formed in said outer surface (155);
Wherein the at least one held in the insert pocket (156), a cutting tool comprising at least one cutting insert according to claim 1 (100), (150). The peripheral surface (104) of the cutting insert (100) has two abutment recesses (122), each of which extends longitudinally away from each clamping recess (108), and the abutment The recess (122) faces away from the longitudinal insert shaft (A),
Each insert pocket (156)
A pocket contact surface (158) in contact with any one of the contact contact surfaces (124) of the contact recess (122) of the cutting insert (100);
A pocket clamp surface (160) in contact with an insert clamp surface (130) of a first recess of the clamp recess (108) of the cutting insert (100);
Wherein said one contact to the pocket support surfaces of the cutting face (112) and (162), of the cutting insert (100),
The cutting tool (150) further comprises member clamping surface (166), first and second member fixing surface (172, 173), the clamping member (164) having,
When the cutting insert (100) is placed in the insert pocket (156), the clamping member (164) is such that the member clamping surface (166) of the clamping recess (108) of the cutting insert (100). The cutting tool (150) according to claim 13 , wherein the cutting tool (150) is clamped against the insert pocket (156) so as to be pressed against the insert clamping surface (130) of a second recess. The insert pocket (156) further includes first and second pocket securing surfaces (170, 171);
The first pocket fixing surface (170) extends from the pocket contact surface (158) in a direction away from the outer surface (155);
The second pocket fixing surface (171) is disposed on the opposite side of the first pocket fixing surface (170) and faces the first pocket fixing surface (170);
Cutting tool (1) according to claim 14 , wherein the first and second pocket fixing surfaces (170, 171) are in contact with the respective first and second member fixing surfaces (172, 173) of the clamping member (164). 150). The cutting tool (150) according to claim 15 , wherein the cutting tool (150) is a rotary tool having a rotation axis (R) and the outer surface (155) is a circumferential surface of the rotary tool. The insert pocket, said pocket fixed surface has a fastening hole disposed adjacent to the (170, 171) (174), said clamp member (164) has a through hole (176), fastening screws (178 16. The cutting tool (150) of claim 15 , wherein the threading is threaded against each thread face of the through hole (176) and the fastening hole (174).

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